Web development tools
Here are a couple of web development tools all firefox extensions
Web Developer Extension
The Web Developer extension adds a menu and a toolbar to the browser with various web developer tools. It is designed for Firefox, Flock and Mozilla, and will run on any platform that these browsers support including Windows, Mac OS X and Linux.
Another one is great for making sure your site looks right in firefox and IE without having to open IE.
This extension uses your IE rendering engine to display the html page in firefox.
If you need firefox…
Quick ‘n easy CSS borders/shadows you name it!
The Octopus Engine attempts to unify techniques for rounded corners, drop shadows, custom borders and faux columns, all in one pretty package. It’s an all-in-one, one in all approach, encompassing whatever effects one needs.